reuse function added, but not working yet

[FalafelGood]

Hi,

As promised, I spent some time today looking over the code and giving my best stab at the reuse function we discussed in issues. It doesn't work yet, (I can't get the argument types to match) but I figured I would make a PR anyways to share my progress and get feedback.

To reiterate: This function does not work! Do not accept this PR without advising or fixing first!!

If there's a better way in the future for me to share code without PR, please let me know. This feels incorrect.
Cheers,

• Falfafel

[bramtayl]

Thanks for giving it a shot! I was imagining using keyword arguments instead. The Dict wouldn't be type stable because the values are typed as Any.

[gdalle]

Hey @FalafelGood! This looks like a very general reuse method, which may work on basically any mutable struct. Maybe coding something more specific to MetaGraphs would be easier? Perhaps using keyword arguments like this:

function reuse(
    g::MetaGraph{...,GraphData,...},
    new_graph_data::GraphData=g.graph_data
) where {GraphData}
    # do stuff
end